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Merger - Business Acquisition Pro Forma Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Business Combination, Separately Recognized Transactions [Line Items]
Net interest income after provision for loan losses	$ 10,515	$ 9,415
Noninterest income	4,402us-gaap_NoninterestIncome	4,624us-gaap_NoninterestIncome
Net income	3,171us-gaap_NetIncomeLoss	2,712us-gaap_NetIncomeLoss
Basic	$ 0.36us-gaap_EarningsPerShareBasic	$ 0.27us-gaap_EarningsPerShareBasic
Diluted	$ 0.29us-gaap_EarningsPerShareDiluted	$ 0.22us-gaap_EarningsPerShareDiluted
Pro Forma [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Net interest income after provision for loan losses	11,508	10,462
Noninterest income	4,834	4,713
Net income	$ 2,598	$ 2,910
Basic	$ 0.28	$ 0.29
Diluted	$ 0.24	$ 0.24

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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